A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

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Mr Sargent said without changes to labour markets other action on the Brisbane G20 agenda, such as boosting trade and investment in infrastructure, would be hampered.

"It's not going to be easy but I don't think we are going to have a lot of choice," Mr Sargent said.

Robert Milliner, the B20's "sherpa", gave the example of a cinema chain owner who was compelled due to workplace laws to offer eight-hour shifts when university students were only seeking two or three hours of work a day.